Hey Everett
No worries at all really appreciate your input !
I cant share since whilst i know Moz community a highly ethical bunch of lovely people this is a new very precious client of mine i cant afford to risk losing should anyone see and try and pitch for the biz, as unlikely as that is i cant risk the possibility but have pm'd you just in case your happy to have a look.
I started this thread after looking at GWT and looking at the reports. I have told dev to 301 any old pages to their new equivalents or HP if not. Then to apply code as per Altecs advice to to batch process 301's for any remaining. They are increasing at aprox 150 new page not founds each day so something clearly going on but hopefully if dev deploy all the above that should reverse the ever growing spike do u think ?
I have told them once they do that to mark all as fixed in GWT and then just attend to any that recur afterwards on a case by case basis.
Any further help advice much appreciated, especially if above unlikely to resolve ?
All Very Best
Dan